Bending press



May 18 1926. 1,585,212

F. G. scHRANz BENDING PRES S Filed March 6, 1924 2 Sheets-Sheet l May 181926.

F. cs. scHRANz Patented May 18, 1926.

UNITED STATES PATENT- OFFICE.

FEEDERICK GEORGE SCI-IRANZ, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOSOUTI-IWARK FOUNDRY & MACHINE COMPANY, OF PHILADELPHIA, PENNSYL- VANIA,A CORPORATION OF PENNSYLVANIA.

BENDING PRESS.

AppIication filed March 6, 1924. Serial No. 697,399.

My invention is directed more particularly to that form of bending pressin which the cooperating dies, or die and anvil, are :mountedhorizontally; one die, which may constitute the anvil, occupying a fixedor substantially fixed position, and the other or shaping die beingarranged for movement relatively to the same; in the present instanceupwardly on the working stroke.

My present invention comprises a construction in which the anvil die iscarried by a cross-head, which may be supported by a pair of columns atone end of the press and held in horizontal position against deflectionwhich might be occasioned by the pressure of the shaping die whenbrought into contact with work to be operated upon by said dies, bylinks hinged to the base of the press; such links being suitablyconnected together at the top and operatively engaging the cross-head,and for this purpose they may be apertured to receive a cross-pin whichmay be arranged to overlie the end of said cross-head.

The pivotally mounted links may be swung away from their engagement withthe cross-head to permit cylindrical work to be placed in operativeposition and removed, when corrugating boiler sections for instance, andfor the removal of other kinds of work, and the operation of these linksis under the conrol of a suitable piston mounted in a cylinder which maybe arranged to swing on trunnions with respect to the press frame so asto be capable of eecting move? ment of said links in both directions.

These and other features of my invention are more fully describedhereinafter; reference being had to the accompanying drawings, in which:

Figure 1, is a front elevation, partly in section, of a bending pressembodying the features of my invention.

Fig. 2, is a plan view of the same.

Fig. 3, is an end elevation looking the direction of the arrow :0, Fig.1.

Fig. 4 is a sectional elevation of the cylinder and piston employed foroperating the pivoted links, and

Fig. 5, is a diagrammatic view illustrating the dies in operativeposition with respect to a sheet formed into a substantially rectanguiar shell.

In the drawings, l represents the base of my improved bending press,which may have a pair of cylinders 2, each provided with a ram 3,suitably placed with respect to said cylinders; said rams beingattachedto a bed plate 4, to which the lower die or shaping member 5, isdetachably connected. This die or shaping member 5 is of a removablecharacter in order that changes in dimension or form for different workoperations may be made as desired, ,and the bed plate 4 may be groovedat 4a to receive ribs 5a carried by dies or shaping members of thegeneral type indicated at 5.

At one end of the base section, a pair of columns 6 are supported in anysuitable manner, and a crosshead 7 is secured to the upper ends of thesecolumns; the base of the press and said cross-head each being provided'with outwardly projecting brackets, lndicated at 8 and 9, respectively,with a tension or tie bolt 10` connecting said brackets whereby thecross-head may be held in a substantially horizontal and fixed position.The columns may be provided with stop collars or nuts 11, adjustablethereon, to determine the height at which said cross-head is supported,and the bolt 10 may be threaded to an extent to permit the desiredadjustment, or bolts of diiferent length may be employed. The cross-head7 may carry a detachable anvil or die member of the type indicated at12, which may have a rib 12a, adapted to a groove 7a, in said-cross-head.

Disposed at the end of the press opposite the columns for the purpose ofholding the cross-head 7 against deflection when pressure is appliedupon movement of the lower die or shaping member 5 with respect to theanvil or upper die 12 connected to said cross-head, are a pair of links15, having a pivotal mounting comprising a pin 16, to which they aresecured; such pin passing through the apertured end of a stem 17, whichmay be mounted in an apertured boss 18, carried by the base of the pressand held in position by a collar or nut 19, at the lower end of thesame. This stem is acl-- justable so that if changes are made in theposition of the cross-head with respect to the bed plate by raising orlowering the cross-head on the columns 6, corresponding change can bemade in the position of the links for proper engagement with saidcross-head.

The links normally occupy the operative position shown by full lines inFigs. l, 2 and 3, and they may be provided at t-heir upper ends with across-pin 20, overlying the projecting end Zh oit the cross-head 7. Thelinks are held against lateral displacement with respect to thecross-head when in operative position by means ont a suitable pin 2l,passing through the end 7b of the cross-head.

The links are movable upon their pivotal connection 16 to the positionshown by dotted lines when it is desired to introduce cylindrical workinto the press or to remove other types of work operated upon, and suchmovement may be e'lrected by providing the pivot pin 1G, which is fixedto the links, with a forked crank 25, to which is connected a piston rod26, having a piston 27, adapted to a cylinder 28; the latter beingprovided with trunnions 29, whereby it may swing in brackets 30, carriedat the end ot the press base. Such cylinder is connected with a suitablesource of pressure by a pipe 3l for the introduction et fluid to raisethe piston and move the links into the position shown in Fig. l, and'tor the exhaust of such fluid to lower the piston when it is desired tolower the links to the position indicated by dotted lines. A suitablestop 32 may be provided upon which said links may rest when in thelowered position. The cylinder 2A is preferably set to one side at theend ot the base, so that the links may be raised and lowered withoutinterference with their operating means.

n practice, a'lter suitable dies or shaping members have been secured inplace in the anvil and the movable bed plate, the work to be acted upon,a metal sheet for instance, is introduced between the same, and pressurebeing supplied to the cylinders 2, the rams 3 will be lifted and withthem the bed plate and lower die which will crowd the work into theupper die, imparting to the plate the desired configuration. In Fig. 5,l have illustrated the bending ot a sheet to form a square tank orshell, indicated at A, lt a cylindrical object is to be operated upon,the retaining pin 2l is removed and the links are lowered to theposition shown by dotted lines by proper direction of pressure to thecylinder 28, or by their own weight when the cylinder is open to ei;-haust, and after the work to be operated upon has been put in place, thelinks will be returned to operative position by admitting pressure tothe cylinder 28 to raise the piston 27, and operation of the structuremay proceed as in connection with ordinary tlat work; the links beinglowered when cylindrical work or work such as illustrated in Fig. 5, isto be removed.

As will be understood, pressure may be admitted to the cylinders 2 tomove the rams 3 upward, and exhausted from said cylinders to permitdownward movement et the same, via a pipe 35, having separateconnections 235 and 35h, leading to the respective cylinders; said pipeo5 being connected to a suitable source of l'luid pressure.

l claim:

l. In a bending press, the combination of a base, a cylinder disposedtherein, a ram adapted to said cylinder, a horizontally disposedinovable bed plate connected to said ram, vertically disposed columns atone end oi the press for guiding said bed plate, a horizontal cross-headcarried by the upper ends oi said columns, means for normally holdingsaid cross-head in horizontal position, a link pivotally connected tothe base opposite said columns with its upper end in operativeengagement with said crossliead whereby the latter is held againstdetlection when the work is brought into contact therewith by themovable bed plate, and fluid-operated means for raising and loweringsaid link into and out of operative engegement with the cross-head.

2. ln a bending press,the combination oitI a base, a cylinder disposedtherein, a ram adapted to said cylinder, a horizontally disposed movablebed plate connected to said4 ram. columns at one end of the press forguiding' said bed plate, a horizontal crosshead carried by the upperends of said columns; said cross-head having aligned end extensions,means connected to one of said extensions ior maintaining the cross-headin horizontal position, links pivotally connected to the base oppositesaid columns, a cross-pin carried by said links and overlying theopposite end extension ot said cross-head whereby the latter is heldagainst deflection when the work is brought intol Contact therewith bythe movable bed plate, and means for raising and lowering said links.

3. ln a bending' press, the combination of a base, a cylinder disposedltherein, a ram adapted to said cylinder, a horizontally disposed movablebed plate connected to said ram, a die member det-achably secured tosaid bed plate, columns at one end of the press :t'or guiding said bedplate, a horizontal cross-head carried by the upper ends of saidcolumns; said cross-head having aligned end extensions an anvil or diemember detachably connected to said cross-head for cooperation wit-h thedie member carried by the bed plate; the latter having aligned endextensions underlying those of the crosshead; outwardly projectingbrackets carried by the base and cross-head, a tension bar connected tothe end extensions of the cross-head and base at one end ot thestructure, links pivotally connected to the base extension opposite saidcolumns and in operative engagement with the extension of saidcross-head whereby the latter is held against deflection when the workis brought into contact therewith by the movable bed plate, and meansfor raising and lowering said links.

4. In a bending press, the combination of a horizontally disposed base,a cylinder disposed therein, a ram adapted to said cylinder, avertically movable bed plate connected to said ram, a die memberdetachably secured to said bed plate, columns at one end of the pressfor guiding said bed plate, a cross-head carried by the upper ends ofsaid columns, an anvil or die member detachably connected to saidcross-head for cooperation with the die member carried by the die plate,aligned extensions projecting from the base and cross-head, a tensionbar disposed between and connecting the base and cross-head extensionsat one end of the structure7 links pivotally connected to the baseextension opposite said columns, a cross-pin carried by said links andoverlying the end extension of said cross-head whereby the latter isheld against deection link in fixed relation therewith, a cylinder voperatively connected to the aligned eXtension of the base, a piston insaid cylinder connected to said crank arm, and means for directingpressure to said cylinder to raise and lower said link.

6. In a structure such as set forth in claim l, a crank arm connected tothe pivot pin for the link, a swinging cylinder carried by the endextension of the press base, a piston in said cylinderI connected tosaid crank arm, and means for directing pressure to said cylinderwhereby the piston may be operated to raise and lower said link.

In witness whereof I have signed this specification.

F. G. scHRANz. l

